How much will solar panels produce in Bilbao?

A 5 kWp system facing south at 35° tilt in Bilbao produces about 5,734 kWh a year. In a weak year that is 4,794 kWh, in a good one 6,674 kWh — 1,147 kWh per kWp.

That’s about 174% of a typical home’s yearly use (3,300 kWh).

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Based on 2014–2023 satellite weather data

Production by month

0200400600800JanJanuary: 5 kWp 259 kWh, range 183–334FebFebruary: 5 kWp 359 kWh, range 249–468MarMarch: 5 kWp 493 kWh, range 394–593AprApril: 5 kWp 554 kWh, range 444–664MayMay: 5 kWp 612 kWh, range 496–728JunJune: 5 kWp 573 kWh, range 463–683JulJuly: 5 kWp 606 kWh, range 495–717AugAugust: 5 kWp 634 kWh, range 528–740SepSeptember: 5 kWp 570 kWh, range 469–671OctOctober: 5 kWp 452 kWh, range 366–539NovNovember: 5 kWp 297 kWh, range 213–382DecDecember: 5 kWp 274 kWh, range 196–352

kWh per month

A typical day in August

The sunniest month in Bilbao. Output peaks around 11:00 solar time, at about 2.5 kWh in the best hour.

0:006:0012:0018:0023:00 2.5 0

Month by month

Month Weak year, kWh Typical year, kWh Good year, kWh
January 183 259 334
February 249 359 468
March 394 493 593
April 444 554 664
May 496 612 728
June 463 573 683
July 495 606 717
August 528 634 740
September 469 570 671
October 366 452 539
November 213 297 382
December 196 274 352
Year 4,794 5,734 6,674

The months don’t add up exactly to the yearly figure, because each one is the typical value across many years.

Common questions

How much do solar panels produce in winter in Bilbao?

From November to February the system produces about 1,188 kWh, which is 21% of the year. The weakest month (January) gives roughly 259 kWh.

Is an east-west roof worth it in Bilbao?

An east-west system typically produces 10–25% less per kWp than one facing south, but spreads production more evenly through the day. The exact difference depends on tilt and shading.

Compare an east-west roof for Bilbao

Ground mount or roof in Bilbao?

A ground mount can be tilted and aimed freely, which can add some yield, but it costs more and needs space. Compare both for your own plot.

Check a ground-mounted system in Bilbao

Your roof is not an average roof

Set your own tilt, direction, shading and inverter limit and get a range for your address.

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Climate data: Photovoltaic Geographical Information System (PVGIS) — European Commission, Joint Research Centre